Effect of mixed yeast of acetic bacteria on acid production from micro-aerobic hydrolysis of excess sludge
WANG Chun-yan, ZENG Wei, XU Huan-huan, LI Ning, PENG Yong-zhen
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
This study focused on the optimal concentration of yeast mixed with acetic bacteria to promote sludge hydrolysis and acidification. The concentrations of orthophosphate, ammonia nitrogen and soluble COD released from sludge were investigated. The changes of protein and polysaccharide in extracellular polymeric substances (EPS) at different layers were also studied. At yeast and acetic acid bacteria dosage of 10 and 20g/L, the highest short chain fatty acids (SCFAs) production of 719mgCOD/gVSS was achieved on the fifth day of fermentation, in which the acetic acid was 328.78mgCOD/gVSS, accounting for 45.72% of the total SCFAs. Adding exogenous bacteria significantly promoted the hydrolysis of excess sludge to produce SCFAs with acetic acid as the main component. The addition of exogenous bacteria promoted the release of ammonia nitrogen and orthophosphate during hydrolysis acidification. The maximum release of ammonia nitrogen and orthophosphate was 80.66mg/gVSS and 22.38mg/gVSS under the optimal conditions, respectively, which was conducive to the recovery of nitrogen and phosphorus from excess sludge. The release of proteins and polysaccharides from the inner layer to the outer layer of EPS was improved, providing substrates for acid production. Exogenous addition of yeast and acetic acid bacteria was an effective means to promote hydrolysis and acidification of excess sludge.
王春燕, 曾薇, 许欢欢, 李宁, 彭永臻. 混合外源菌强化剩余污泥微氧水解产酸[J]. 中国环境科学, 2020, 40(1): 252-260.
WANG Chun-yan, ZENG Wei, XU Huan-huan, LI Ning, PENG Yong-zhen. Effect of mixed yeast of acetic bacteria on acid production from micro-aerobic hydrolysis of excess sludge. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(1): 252-260.
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